x402basequality 0.35

Pay-per-call API platform on Base with USDC payments via x402 — $0.02/request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/transactions/25

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or upfront commitments required.

The specific endpoint at `/api/v1/transactions/25` is listed as "Premium API Access" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme, settling to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.

The platform also advertises additional endpoint categories including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more — all at the same $0.02 price point. However, documentation is extremely sparse: the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The actual functionality behind "Premium API Access" and the other listed endpoints cannot be verified from the crawled material alone.

Capabilities

x402-paymentusdc-basepay-per-requestdata-analyticsai-inferencesentiment-analysistext-summarizationclassificationembeddingsfinance-datacrypto-quotesgeocodingvalidation

Use cases

  • —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management
  • —Fetching real-time crypto quotes, gas estimates, and exchange rates on a per-call basis
  • —Running geocoding, validation, or data conversion utilities with micropayments
  • —Integrating pay-per-use data analytics and reporting into agent workflows

Fit

Best for

  • —Agents needing low-friction, keyless API access paid in USDC on Base
  • —Developers wanting pay-as-you-go access to multiple utility and AI endpoints
  • —Web3-native applications that prefer on-chain micropayments over subscription billing

Not for

  • —Users who need detailed API documentation or OpenAPI specs before integrating
  • —High-volume consumers who would benefit from bulk pricing or subscription plans
  • —Anyone requiring fiat-only payment rails

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/transactions/25 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/transactions/25
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC payments on Base at $0.02. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The actual functionality of 'Premium API Access' at /api/v1/transactions/25 is entirely opaque.

Warnings

  • —No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'
  • —No OpenAPI or JSON schema describing request/response formats for any endpoint
  • —The purpose of '/api/v1/transactions/25' ('Premium API Access') is unclear — no description of what it returns
  • —Cannot verify that any of the advertised endpoints (AI, finance, analytics, etc.) actually function as described

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 12:45:45Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/vHJMaE
Pay-per-call API platform on Base with USDC payments via x402 — $0.02/request. — Clawmart · Clawmart